| 变换域水印的量化模型分析 |
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| 引用本文： | 崔国华,袁隽. 变换域水印的量化模型分析[J]. 计算机工程与应用, 2005, 41(36): 111-113,169 |
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| 作者姓名： | 崔国华 袁隽 |
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| 作者单位： | 华中科技大学计算机学院,武汉,430074;华中科技大学计算机学院,武汉,430074 |
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| 基金项目： | “十五”国家密码发展基金资助项目 |
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| 摘 要： | 随着水印技术的不断应用,建立水印测评理论基础的需求越来越迫切。基于量化的水印嵌入方法是一类能够实现盲抽取的重要方法。文章对经典变换域量化模型进行数学分析,讨论了量化步长对于水印视觉可见性的影响,估算了含水印图像的峰值信噪比(PSNR)的理论下限,并通过实验验证了理论分析的结果。
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| 关 键 词： | 数字水印 量化 视觉可见性 量化步长 峰值信噪比 |
| 文章编号： | 1002-8331-（2005）36-0111-03 |
| 收稿时间： | 2005-07-01 |
| 修稿时间： | 2005-07-01 |
An Analysis of the Quantization Model of Watermark in Transform Domain |
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| Cui Guohua,Yuan Jun. An Analysis of the Quantization Model of Watermark in Transform Domain[J]. Computer Engineering and Applications, 2005, 41(36): 111-113,169 |
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| Authors: | Cui Guohua Yuan Jun |
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| Affiliation: | Huazhong University of Science and Technology,Wuhan 430074 |
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| Abstract: | As a number of watermark methods have been proposed in application,the necessity of building a theoretical basis to evaluate watermark algorithms become more and more important.Embedding message based on quantization is a key method to realize blind extract.In this paper,the classic Quantization Model of Watermark in Frequency Domain is analyzed and how quantifying step size affects the visibility of watermark is discussed,and theoretic inferior limit of the Peak Signal-to-Noise Ratio(PSNR) is estimated for the watermarked image.These theoretical analysis results are verified by experiments. |
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| Keywords: | digital watermark quantization visibility quantifying step size peak signal to noise ratio |
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